Tooth-brush and process of manufacturing the same.



D; L. CHANDLER & J. H. TRAYNE.

TOOTH BRUSH AND PROCESS OF MANUFACTURING THE SAME. APPLICATION FILEDJUNE 23. 1916.

1,238,635., Patented Aug. 28, 1917.

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TOU'TLH-BRUSH AND PROCESS OF MANUFACTURING THE SAME.

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Specification of Letters Patent.

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Application filed June 23, 1916. Serial No. 105,511).

To all whom it may concern:

Be it known that We, DANIEL L. CHANDLER and JoHN H. .TRAYNE, citizens ofthe United States, residing at Fitchburg and Groton, in the counties ofWorcester and Middlesex and State of Massachusetts, have invented newand useful'fmproveinents in Tooth-Brushes and Processes of Manufacturingthe Same, of which the following is a specification. This inventionrelates to an improved process of manufacturing tooth brushes, theobject of the invention being to provide a cheap and efficient processwhereby a brush may be manufactured which is so constructed that thebristles are absolutely locked into the body portion of the brush sothat they cannot be detached therefrom.

The invention consists in the improved process hereinafter set forth inthe specification and particularly pointed out in the claims.

Referring to the drawings;

Figure 1 is a tion of the brush.

Fig. 2 is an enlarged section of the body are recesses provided in thebody portion of the brush and 8, 8 are the tufts of bristles. The brushis manufactured by the following described process:

The individual bristles forming the tufts are preferably coatedintermediate their ends with a coating 9 of collodion. Said collodion isallowed to dry and the bristles are laid across the body portion of thebrush and above one ofthe recesses 7 therein, as illustrated in Fig. 2.A locking plug 10 preferably of celluloid is then brought intocontactwith the coated portion of said bristles and the same are forcedinto a recess 7 by said plug, thus doubling said bristles plan view ofthe body perintermediate their ends at the coated portion thereof andforming one of the tufts 8. The plug 10 is of the same length as therecess 7 (see Fig. 1) so that its oppositeends abut against the oppositeends of'said recess and subdivide the same into two slots 7, 7, thebristles being doubled between their ends in said recess and projectingout of said recess through said slots 7' on opposite sides of said plug.The recess is preferably of greater length longitudinally of said bodyportion of the brush than is the width of said recess. The body portionof the brush is preferably made of celluloid. After the bristles havebeen forced into the recesses 7 by the locking plug 10, said coating,plug and the body portion of said brush adjacent to said slots arerendered plastic by means of a solvent, preferably glacial acetic acidand ether. Said coating, plug, and the body portion of said brushadjacent to said slot thus become intimately combined and are thenallowed to cool and harden, whereby said coating, plug, and the bodyportion of said brush become as one piece, being of substantially thesame material and the bristles are thus firmly icclred in said bodyportion of said brush.

While we prefer to employ a solvent to render the celluloid of the brushbody adj cent to the slot, the plug and the coating on the bristlesplastic so that said coating, plug and said portion of said brush bodyalt become plastic and then become intimately combined, and finallyallow said coating plug and said portion of said brush body to solidify,it is to be understood that this invention contemplates a processwhereby the bristles are coated intermediate their ends as hereinbeforeset forth and are forced into a recess in the brush body formed ofcelluloid by means of a locking plug formed of celluloid Withoutdissolving said parts of celluloid by means of a solvent.

It will be seen by the emploment of the process hereinbefore described abrush is obtained in which the bristles are firmly locked to the bodyportion of the brush by the plug and the recess becomes entirely filledby the bristles and plug, the bristles being hermetically sealed andlocked within the body portion of the brush, so that there ,Will beabsolutely no spaces, however minute for any foreign matter to enter.The brush can thus at all times be easily cleansed and is hygienic inevery respect.

We claim:

1. The herein described process of manufacturing tooth brushes whichconsists in coating a plurality of bristles intermediate their ends withcollodion and allowing said collodion to dry; then doubling saidbristles by means of a plug of celluloid at the coated portion thereofand forcing them by means of said pluginto a recess of the same lengthas said plug provided in a brush body made of celluloid with theopposite ends of said plug abutting against the opposite ends of saidrecess; then rendering said coating,

plug and the portion of said brush body adjacent to said slot plastic bymeans of a solvent, whereby said coating, plug and said portion of saidbrush body all become plastie and are intimately combined; and finallyallowing said coatingplu portion of said brush to so ldify.

2. The herein described process of manuand said body facturing toothbrushes which consists in doubling a plurality of bristles intermediatetheir ends by means of a plug of celluloid and forcing them by means ofsaid plug into DANIEL L. CHANDLER. JOHN H. TRAYNE.

Witnesses: CHARLES D. SHERY,

BERTHA M. Mooney. J

